如何在Java中居中显示Graphics.drawString()? [英] How can I center Graphics.drawString() in Java?

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问题描述

我正在研究 Java 游戏的菜单系统,我想知道如何将文本置于 Graphics.drawString(),如果我想绘制一个中心点在 X:50 Y:50 的文本,文本 30 像素宽, 10 像素高,文本将从开始X:35 Y:45

I'm currently working on the menu system for my Java game, and I wonder how I can center the text from Graphics.drawString(), so that if I want to draw a text whose center point is at X: 50 and Y: 50, and the text is 30 pixels wide and 10 pixels tall, the text will start at X: 35 and Y: 45.

我可以确定宽度在我画画之前的文字?

然后这将很容易数学。

Can I determine the width of the text before I draw it?
Then it would be easy maths.

编辑:我也想知道我是否可以得到文本的高度,这样我也可以垂直居中。

I also wonder if I can get the height of the text, so that I can center it vertically too.

感谢任何帮助!

推荐答案

我在这个问题

我使用的代码看起来像这样:

The code I used looks something like this:

/**
 * Draw a String centered in the middle of a Rectangle.
 *
 * @param g The Graphics instance.
 * @param text The String to draw.
 * @param rect The Rectangle to center the text in.
 */
public void drawCenteredString(Graphics g, String text, Rectangle rect, Font font) {
    // Get the FontMetrics
    FontMetrics metrics = g.getFontMetrics(font);
    // Determine the X coordinate for the text
    int x = rect.x + (rect.width - metrics.stringWidth(text)) / 2;
    // Determine the Y coordinate for the text (note we add the ascent, as in java 2d 0 is top of the screen)
    int y = rect.y + ((rect.height - metrics.getHeight()) / 2) + metrics.getAscent();
    // Set the font
    g.setFont(font);
    // Draw the String
    g.drawString(text, x, y);
}

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